Pump



1,4503% cs. L. KOLLBERG PUMP Filed Aug. 29, 1921 2 sheets-sheet 1IASILMH G. L. KOLLBERG PUMP Filed Aug. 29, 1921 2 sheets-sheet 2Patented Apr. 3, 1923.

GUSTAF L. KOLLBEBG, OF MILWAUKEE, WISCONSIN, ASSIGNOR ALT MANUFACTURINGCOMPANY, OF MILVTAUKEE, "WISCOl SIN, A

DELAWARE.

IS-CH "TLLTIEERS CUEPGRATIOll-l OF PUMP.

Application filed August 29, 1921. Serial No. 436,204.

To all whom it may concern:

Be it known that GUSTAF L. KoLLBnnG, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, has invented a certain new and useful Improvement in Pumps,of which the following is a specification.

This invention relates to pumps.

Synchronous alternating current motors have been applied for the purposeof driving pumps but one of the difiiculties en countered is that it isnot possible to vary the discharge capacity of the pump for the reasonthat the speed of the synchronous motor cannot be varied as it dependson the frequency ofthe alternating current. It is accordingly a generalobject of this invention, to provide simple and efficient means wherebythe delivered capacity, of a pump may be varied. It is, further, anobject of this invention to provide a synchronous-motordriven pump unit,or a pump unit driven by a motor the speed of which cannot be varied,but in which the delivered capacity maybe varied. Other objects willappear hereinafter as a description of the invention proceeds.

The novel features of the invention will appear from this specificationand the accompanying drawings forming a part thereof and showing oneembodiment of said invention and all these novel features are intendedto be pointed out in the claims.

In the drawings, Fig. 1 is a plan view of a pump unit embodying thefeatures of the invention;

Fig. 2 is a side elevation of the pump unit shown in Fig. 1;

Fig. 3 is a vertical sectional View of one of the cylinders of the pumpunit shown in Figs. 1 and 2.

The pump unit is shown in the drawings as comprising a synchronous motor1 drivingly connected in any suitable manner to a pair of double actingplungers 2, 3. The number of these plungers is not material. Plunger 2has associated therewith a pair of cylinders l, 5 and plunger 3 hassimilarly associated therewith a pair of cylinders 6, 7. The pairs ofcylinders i, 5 and 6, 7 are here shown as respectively mounted on hollowbases 8, 9 connected by means of a common suction pipe 10 in turnconnected to the -main suction pipe 11. A pipe 12 is here shown asproviding a common discharge for cylinders l, 5 by connecting thedischarge end of these cylinders. The discharge ends of cylinders 6, 7are similarly connected by means of pipe 13. A pipe connection 1% ishere shown as connected at the respective ends thereof to the dischargeends or cylinders a, 6 whereby the discharge from all cylinders i, 5, 6,7 may reach a main discharge pipe 15. The discharge pipe 15 may beprovided with a check valve 16. The pipe connection id may haveconnected therewith a pipe 1'? leading to the suction or sump or thepump unit and a valve 18 may be provided in the pipe i7.

iiiei erring now to 3 in which cylinder 4 shown in vertical section,this cylinder is here shown as provided with a suction valve and adischarge valve 20 of any suitable type. A by-pass 21 is providedwhereby the cylinder may be connected to its discharge. The by-pass ishere shown as connected to the cylinder through the passage 22 and tothe discharge through the passage 23. The by-pass is provided with avalve 2% by means oi which it may be closed at will. By reference toFigs. 1 and 2 it will be seen that each of the remaining cylinders 5, 6,7 may be similarly provided with by-pass connections 25, E26, 27respectively having valves 28, 29, 80.

The operation of the pump unit is as follows:

In starting 'the unit it is preferable to open the valve 18 so as tounload the cylinders and permit discharge into the suction. All of thebypass valves may also be open during the starting period. When thevalve 18 and all of the bypass valves have been closed the pump unitwill deliver its full capacity with the synchronous motor 1 runningunder normal conditions. it it is now desired to decrease the dischargecapacity, one of the bypass valves 24, for example, may be opened. Underthese conditions, as-

suming plunger 2 to be entering cylinder 5,

the suction valve of cylinder 5 will be closed and the discharge valveopen. The water or other fluid discharged from cylinder 5 will pass tothe discharge and through pipe 12 and anequal quantity of water willenter cylinder 4 through by-pass :21, the suction and discharge valvesof cylinder d being closed. It will be noted that on this stroke nowater is pumped into the main discharge pipe 15. On the other stroke,When the plunger 2 enters cylinder 4, water will be discharged throughby-pass 21 into the discharge and this water will pass into maindischarge pipe inasmuch as no water can enter cylinder 5 from thedischarge becausethe discharge valves of said cylinder will be closed.During this stroke, however, water is drawn into cylinder 5 through thesuction valve thereof by the action of the plunger. It will thus benoted that the bypass associated with a given cylinder must be largeenough to pass the capacity of the cylinder associated with said givencylinder.

ll? it is desired to still further reduce the discharge capacity of thepump unit any desired additional number of the by-pass valves 28, 29,may be opened.

It should be understood that it is not desired to limit the inventionclaimed to the exact details oi? construction shown and described, forobvious modifications will ocour to one skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. A pump unit including a plurality of cylinders and associated,plungers, a motor constrained to operate at a constant speedirrespective of load drivingly connected to said plungers, and meanswhereby said pump unit may be caused to deliver the .capacity of all orany desired number of said cylinders without changing the speed oisaidmotor.

2. A pump unit including a plurality of cylinders and associatedplunge-rs, a motor constrained to operate at a constant speedirrespective of load drivingly connected to said plungers, and .meansincluding a :bypass between each cylinder and the .discharge thereofwhereby said pump unit "may be caused to deliver the capacity of all orany desired number of said cylinders Without changing the speed of said.motor.

3. In a pump, a double acting plunger, a pair of cylinders for saidplunger, a common discharge for said cylinders, a set of discharge andsuction valves for each cylinder, and a closeable by pa-ss between oneof said cylindersand the discharge thereof said b -pass beingrlargeenough to pass the capacity of the other of said cylinders at maximumdischarge rate.

4:. In combination, a motor-constrained to operate at a constant speedirrespective of load, a double acti1 g,13lii1iger drivingly connected tosaid motor,a pair of cylinders for said plunger, a common discharge forsaid cylinders, a set of discharge and suction valves for each cylinder,and a closeable bypass between one of said cylinders and the dischargethereof.

In combination, a motor constrained to operate at a constant speedirrespective of load, a double acting plunger drivingly connected tosaid motor, a pair of cylinders for said plunger, a common discharge forsaid cylinders, a set of discharge and suction valves for each cylinder,and a closeable bypass between eachot said cylinders and the dischargethereof.

6. In combination, a motor constrained to operate at a constant speedirrespective of load, ,a plurality of double acting plungers drivinglyconnected Tto said motor, a pair of cylinders for each plunger, a commondis charge for each pair ofcylinders, a set of discharge and'suctionvalves for each'cylinderand a closeable by-pass'between a desired numberof said cylinders-and the discharge thereof. 7

' ,7. In combination, a motor constrained to operate at a constant speedirrespective of load, a plurality of double acting plunger-s drivinglyconnectedto said motor, a pair of cylinders for each plunger, a commondischarge for each pair of cylinders, a set of discharge and suctionvalves for each cylinder. and a closeable'by-pass between each cylinderand the discharge thereof.

Intestimony whereof, the signature of the inventor is affixed hereto.

GUSTAF L. KOLLBERG.

